Which song has so many repetitions as used in playing with styles? It makes songs boring.
Arrangerproducers make lots of efforts to produce interesting styles. But each song is individual with characteristics of its own.
"Styles" make them "all the same"
Playing along with midifiles can be big fun anyway and give the performance a necessary portion of dynamics and individualism.
Not to speak of lousy keyboardplayers like me, who plays the guitar and just likes to be accompanied by basslines and drums